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BMI Form - Input Component

📝 Project Description

This part of the BMI calculator is responsible for user input. Users can enter their personal data and calculate their BMI.

🎯 Features

Input Fields

  • Age (1-120 years)
  • Date (calculation date)
  • Weight (1-500 kg)
  • Height (50-250 cm)

Buttons

  • BMI berechnen - Starts the calculation
  • Clear/Reset - Clears all inputs and results

Functionality

  • ✅ Input Validation - Checks for empty fields and valid values
  • ✅ BMI Calculation - Formula: Weight / (Height/100)²
  • ✅ BMI Categories - Underweight, Normal weight, Overweight, Obesity
  • ✅ Local Storage - Saves inputs in browser
  • ✅ Auto-Load - Loads saved data on page start
  • ✅ Responsive Design - Works on desktop and mobile

🚀 Usage

  1. Open formular.html in browser
  2. Fill all 4 input fields
  3. Click "BMI berechnen"
  4. Result is displayed and saved
  5. On reload: Data is still there
  6. "Clear/Reset" deletes all data

💾 LocalStorage

Speicherort: localStorage['bmiData']

Daten werden nach der Berechnung als JSON-String gespeichert:

{
    "age": "25",
    "date": "2025-02-23",
    "weight": "75",
    "height": "180",
    "bmi": 23.1,
    "category": "Normalgewicht",
    "timestamp": "2025-02-23T14:30:45.123Z" // new Date().toISOString()
}

Daten extrahieren

// Einfaches Auslesen
const data = JSON.parse(localStorage.getItem('bmiData'));
console.log(data.bmi, data.category);

// Mit Null-Check
if (localStorage.getItem('bmiData')) {
    const data = JSON.parse(localStorage.getItem('bmiData'));
    console.log('Gespeicherte Daten:', data);
}

Daten löschen

localStorage.removeItem('bmiData');